The best deal I found for the period 31.05.-02.06. (status of April 4):
Hotel Super 8 Munich City North, Am Nordring 4, 80807 Muenchen.
Can be booked for example via www.booking.com or www.expedia.de, free cancellation until May 30. Good connection to MPI by bus.
The following hotels are situated close to the institute or can be easily reached from there:
Hotel Ibis München City Nord
Ungererstrasse 139
80809 München
U-Bahn: U6 (Nordfriedhof, 2 stops from MPI) and close to stop of the Lufthansa shuttle bus to/from the airport
TEL +49 (0)89 /360830
FAX +49 (0)89 /363793
GENERAL INFORMATIONS: H0996@ACCOR.COM
http://ibishotel.ibis.com/gb/hotel-0996-ibis-muenchen-city-nord/index.shtml
B&B Hotel München-Nord
Frankfurter Ring 243
80807 München
walking distance to MPI, about 10 minutes to U6 Studentenstadt
Tel.: +49 (0)89 / 30 65 89 -0
Fax: +49 (0)89 / 30 65 89 -5 55 ?
E-mail: muenchen-nord@hotelbb.com
http://www.hotelbb.de/en/portal/hotels/overview.html?id=13&id=13&type=hotel
Suite Novotel München Parkstadt Schwabing
Lyonel Feininger Strasse 22
80807 München
about 10 minutes walking to U6 (Alte Heide)
Tel : +49 (0)89 / 358190
Fax : +49 (0)89 / 35819199
E-mail : h5229@accor.com
http://www.suitenovotel.com/gb/hotel-5229-suite-novotel-muenchen-parkstadt-schwabing/index.shtml
Hotels downtown Munich:
Hotel Leopold****
Leopoldstrasse 119?
80804 Munich
U-Bahn: Münchner Freiheit U3/U6 (about 700 m)
Phone: +49 (0)89 / 36 70 61
Telefax: +49 (0)89 / 36 04 31 50
E-mail: ?hotel-leopold@t-online.de
http://www.hotel-leopold.de/en/index.html
Motel One München - Sendlinger Tor
Herzog-Wilhelm-Straße 28
80331 München
Phone : +49 (0)89 / 5 17 77 25-0
Fax : +49 (0)89 / 5 17 77 25-10
E-mail: muenchen-sendlingertor@motel-one.com
http://www.motel-one.com/en/hotels/munich/hotel-muenchen-sendl-tor/#t=hotelinfo
Hotel Antares**
Amalienstr. 20
U-Bahn: Universität U3/U6
Tel. +49 89 28 00 200?
E-mail: hotel@antares-muenchen.de
http://www.antares-muenchen.de
Das-Hotel-in-München,
Türkenstr. 35
U-Bahn: Universität U3/U6
E-mail: info@das-hotel-in-muenchen.de
http://www.das-hotel-in-muenchen.de
Hotel Hauser an der Universität ***
Schellingstr. 11
U-Bahn: Universität U3/U6
Tel. +49892866750
E-mail: info@hotel-hauser.de
http://www.hotel-hauser.de
Hotel Carlton Astoria****
Fürstenstr. 12
U-Bahn Universität U3/U6
Tel. +49 (0) 89 / 383 96 30?
E-mail: service@carlton-astoria.de
http://www.carlton-astoria.de/
Hotels in the village of Garching (north of Munich, about 15 minutes by U-Bahn to MPP, good public transportation to the city center, but bad connection to the airport):
IBIS Garching:
http://www.ibis.com/de/hotel-3679-ibis-muenchen-garching/index.shtml
IBIS Budget Garching:
http://www.ibis.com/de/hotel-3089-ibis-budget-muenchen-garching/index.shtml
HOTEL BOOKING SERVICES
The following internet booking portals might be useful for you:
http://www.muenchen.de/int/en/accomodation-hotels.html
http://www.hrs.de
http://www.booking.com
http://www.hotel.info/en/
http://www.trivago.de
